midwestjs 2014 reconciling reactjs as a view layer replacement
DESCRIPTION
Slidedeck from MidwestJS 2014 talk: Reconciling ReactJS as a View Layer ReplacementTRANSCRIPT
Reconciling React as a View Layer Replacement
Zach Lendon @zachlendon
#reactjs #midwestjs #reactjsisawesome
https://github.com/zachlendon/midwestjs2014
Traditional JS MV* “issues”
•“State” •Performance •Complexity •Predictability •Testability
• Isomorphic Javascript • The right simple :: powerful ratio • The right configurable :: opinionated ratio • Pluggable modular architecture • Performant • SEO
Top keys to future “web” MV* framework success
“State” of the JS MV*
Meet React
•A Javascript Library for Creating User Interfaces •https://github.com/facebook/react •Open Sourced and Battle-tested by Facebook and
Instagram •Browser support to IE8
“React is not a full MVC framework, and this is actually one of its strengths. Many who adopt React choose to do so alongside their favorite MVC framework, like Backbone. React has no opinions about routing or syncing data, so you can easily use your favorite tools to handle those aspects of your frontend application. You'll often see React used to manage specific parts of an application's UI and not others. React really shines, however, when you fully embrace its strategies and make it the core of your application's interface.”
@bkonkle: http://lincolnloop.com/blog/architecting-your-app-react-part-1/
Why React?
• “State” is what makes building UIs hard • “Data Changing over time is the Root of All Evil”
React Solution
Use composable React components that effectively re-render themselves on each state mutation
•Apple •Oranges
•Apple •Grapes •Bananas
React
Before After
Virtual DOM
•In-memory representation of the DOM and events system •Even HTML5 events in IE8
Advantages of Virtual DOM
•Interacting with DOM -> Slow, •with Javascript In-Memory Objects -> fast
•60 fps fast •Faster parsing •Faster Validation
•Since no real browser, can easily render on server or client
•Easier To Test
Fallout Advantages of Virtual DOM include
•Autobinding •Event Delegation
http://lincolnloop.com/blog/architecting-your-app-react-part-1/
React Components
React Components translate raw data into rich HTML
The Ultimate State Machine
React Components
React.createClass({..})
The Ultimate State Machine
Render: “pure” Javascript function
http://jsfiddle.net/zlendon/9xyn3/
Render: “pure” Coffeescript function
http://jsfiddle.net/zlendon/32xj5/
Render: Better “pure” Coffeescript function
http://jsfiddle.net/zlendon/32xj5/1/
JSX “Desugared” to native Javascript
Rules of Render•Return a single child component
•Native DOM component •Composite Component
•Return predictable result each time invoked •Does not touch the DOM (read or write) or interact with the
browser (i.e., setTimeout) !
Rules of Server Side Render
!!!
!
•renderComponentToString on server •render on client, to same node, preserves server-rendered
markup and adds event handlers
•http://www.princeton.edu/~crmarsh/react-ssr/ (Charlie Marsh)
•https://github.com/andreypopp/react-async •https://github.com/karlmikko/bleeding-edge-
sample-app/blob/react-router/server/render/render.js (soon to be in React-Router)
tl&dr;
React Components: Input
•Props: immutable data specific to an instance of a component •Like params into a function
•State: Private mutable attribute. Change within which trigger scheduling of a component re-render
Both Props and State
• Are plain JS objects • Changes trigger a render update • Are deterministic. If your Component generates different outputs for
the same combination of props and state then you're doing something wrong.
https://github.com/uberVU/react-guide/blob/master/props-vs-state.md#readme
Rules of State•Belong to only one component •Within that component, modified 2 ways
•getInitialState •setState
•Render returns same result each time invoked with same state
•Do not use computed data or duplicate prop data as state •Avoid using state when possible •Do not change state of children components
Rules of Props
•Passed from the parent • Immutable •Often pass callback functions through them !
Component LifecycleMounting • componentWillMount() • componentDidMount() !Updating • componentWillReceiveProps(object nextProps) • boolean shouldComponentUpdate(object nextProps, object nextState) • componentWillUpdate(object nextProps, object nextState) • componentDidUpdate(object prevProps, object prevState) !Unmounting • componentWillUnmount()
Mixins
•Cross cutting concerns
•Examples: •ReactScriptLoader: https://github.com/yariv/ReactScriptLoader •ReactIntlMixin: https://github.com/yahoo/react-intl •Backbone.React.Component.mixin: https://github.com/
magalhas/backbone-react-component
Scaling React
!!!
!
Action Controller Model View
Conference MVC
• Modified from Flux into by Jing Chen at F8, 2014
Scaling with React
!!!
!
Action Controller Model ViewModelModel
Model
Model
Model
View
View
View
View
View
View
Real World MVC
Scaling with React
!!!
!
Action Dispatcher Store View
Action
Flux
Starting a New App: React•Lots of Great “Full-Stack” Starter Kit Options - Many Listed:
https://github.com/facebook/react/wiki/Complementary-Tools
New Project w/ Routing•React Boilerplate: https://github.com/rackt/react-boilerplate •Uses:
•React-router (prev. react-nested-router) •Translation of Ember Router API to React
•Webpack •pushstate-serv
New Project w/o Routing•https://github.com/newtriks/generator-react-webpack •Yeoman Generator •Uses:
•Webpack •Grunt •Karma
New Project w/ Routing & Server-side Rendering:
•React Quickstart: •https://github.com/newtriks/generator-react-webpack
•Uses: •react-router-component •react-async •express •browserify •npm
New Project: Midwest JS Demo
•React Boilerplate •Plus:
•Express (3) •Bootstrap 3
DEMO DISCUSSION
Adding React To Existing Project
“We don’t need to switch to React everywhere, all at once. It’s not a framework that imposes anything on the application structure. [...] Easy, iterative adoption is definitely something in React’s favor for us.”
!
-Adobe Brackets Team
Backbone Views
•Nested Backbone.View’s are difficult to maintain •Every collection change re-renders all views
Simple Backbone Port
Integration with Backbone Models and Collections
•Trigger React re-render on Backbone model “change” events
Mixins! Maybe
Lost shouldComponentUpdate hooks
TODO MVC: React + Backbone
Mixins! MaybeBackbone-React-Component
Mixins! MaybeBackbone-React-Component
Use State Callback
Use State Callback
Angular and React
Angular Directives Wrapping React
•ngReact
•ngReactGrid
Angular ngReactGrid Demo
Integration Lessons•You can integrate React with other frameworks •Backbone integration works better than many options since re-
rendering on model state change is the typical Backbone approach
•Angular will work best from directives but is a bit of a force fit •Best approach to let React own the DOM element being
rendered into
(Beyond the Obvious) Additional Resources (1/2)•Great Collection of Community links:
https://github.com/mindreframer/reactjs-stuff •Developing User Interfaces with React: http://youtu.be/
1OeXsL5mr4g?list=PLuE9Gq9Mxr5kCvVa7tcwW1S2-FEym5fbt (intro + good performance demo)
•Good Flux intro by Ryan Florence: http://vimeo.com/102953099
•Thorough and infamous Angular/ReactJS performance/integration post: http://www.williambrownstreet.net/blog/2014/04/faster-angularjs-rendering-angularjs-and-reactjs/
•Performance Tools: http://facebook.github.io/react/docs/perf.html
!
(Beyond the Obvious) Additional Resources (2/2)
!•Webpack Howto: https://github.com/petehunt/webpack-
howto •Webpack Hot Module Replacement: https://github.com/
webpack/docs/wiki/hot-module-replacement-with-webpack •Om: https://github.com/swannodette/om •Jest: http://facebook.github.io/jest/
Thank You
Questions?
Zach Lendon @zachlendon
#reactjs #midwestjs https://github.com/zachlendon
#reactjs on freenode